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Authors
Aekthong, Supassorn
Rattanakul, Chontita http://orcid.org/0000-0002-2362-5885
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Funding
Funding for this research was provided by:
Centre of Excellence in Mathematics, Thailand
the Science Achievement Scholarship of Thailand
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Article History
Received: 28 January 2019
Accepted: 4 June 2019
First Online: 18 June 2019
Competing interests
: The authors declare that they have no competing interests.
